US Bridges

I-69 EB over Shiawassee River

Fair

Shiawassee County, Michigan · 3.6 MI SW of M-71 · Structure no. 000000000009734

Built
1961
64 years old, rebuilt 1998
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
180 ft
3 main spans
Daily traffic
13,840
2007 count
Owner
State
State Highway Agency

About this bridge

I-69 EB over Shiawassee River is a steel stringer/multi-beam or girder carrying I-69 EB over Shiawassee River in Shiawassee County, Michigan. It was built in 1961 and reconstructed in 1998, so it is 64 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 13,840 vehicles a day, roughly 22% of them trucks, projected to reach 19,072 by 2018. The structure is 180 ft (54.9 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-69 EB
CrossesShiawassee River
Location3.6 MI SW of M-71
RouteInterstate 69
CountyShiawassee County
StateMichigan
Coordinates42.90547, -84.06274
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.7 US tons
Inventory rating54.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span58 ft (17.7 m)
Deck width49 ft (15 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,840 (2007)
Projected traffic19,072 by 2018
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-69 EB over Shiawassee River built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1998.

What condition is I-69 EB over Shiawassee River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.

How much traffic does I-69 EB over Shiawassee River carry?

About 13,840 vehicles per day (2007 count), of which roughly 22% are trucks.

How long is I-69 EB over Shiawassee River?

The structure is 180 ft (54.9 m) long with a longest span of 58 ft (17.7 m) and a deck 49 ft wide.

Who owns I-69 EB over Shiawassee River?

It is owned by the State Highway Agency.